rbd-mirror: fix multiple rbd-mirror daemon support
rbd-mirror: fix multiple rbd-mirror daemon support

This `run_once: true` breaks multiple rbd-mirror daemons support
as it would make all rbd-mirror daemons use the same keyring.
Each rbd-mirror daemon needs its own keyring in order to start.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2037646

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible